[FEATURE] Added exception handlers

src/main/java/org/parabot/environment/handlers/exceptions/ExceptionHandler.java

@@ -0,0 +1,88 @@
+package org.parabot.environment.handlers.exceptions;
+
+/**
+ * Class to be implemented that allows multiple types of exception handlers
+ */
+public abstract class ExceptionHandler implements Thread.UncaughtExceptionHandler {
+    /**
+     * The name of the exception handler
+     */
+    private final String name;
+
+    /**
+     * The status of the exception handler; Defines if the exception handler is enabled or disabled
+     */
+    private boolean enabled = true;
+
+    /**
+     * The type the handler is meant for
+     */
+    private ExceptionType exceptionType;
+
+    public ExceptionHandler(String name, ExceptionType exceptionType) {
+        this.name = name;
+        this.exceptionType = exceptionType;
+    }
+
+    @Override
+    public void uncaughtException(Thread t, Throwable e) {
+        this.handle(e);
+    }
+
+    /**
+     * Writes the exception to class extending this abstract class
+     *
+     * @param e
+     */
+    public abstract void handle(Throwable e);
+
+    /**
+     * Returns if the exception handler is enabled or disabled
+     *
+     * @return
+     */
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    /**
+     * Sets the enabled status of the exception handler
+     *
+     * @param enabled
+     *
+     * @return
+     */
+    public ExceptionHandler setEnabled(boolean enabled) {
+        this.enabled = enabled;
+        return this;
+    }
+
+    public ExceptionType getExceptionType() {
+        return exceptionType;
+    }
+
+    public ExceptionHandler setExceptionType(ExceptionType exceptionType) {
+        this.exceptionType = exceptionType;
+        return this;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public enum ExceptionType {
+        SERVER("Server"),
+        SCRIPT("Script"),
+        CLIENT("Client");
+
+        private String name;
+
+        ExceptionType(String name) {
+            this.name = name;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+}

src/main/java/org/parabot/environment/handlers/exceptions/FileExceptionHandler.java

@@ -0,0 +1,125 @@
+package org.parabot.environment.handlers.exceptions;
+
+import org.parabot.core.Directories;
+import org.parabot.core.ui.utils.UILog;
+import org.parabot.environment.api.utils.FileUtil;
+
+import javax.swing.*;
+import java.awt.*;
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Writes exceptions to a file and reports the file location back to the user
+ */
+public class FileExceptionHandler extends ExceptionHandler {
+    /**
+     * Directory where the reports get written to
+     */
+    private final File reportsDirectory;
+
+    /**
+     * Defines if the alert should popup during this client instance again
+     */
+    private boolean ignored = false;
+
+    /**
+     * Initializes the exception handler and ensures the reports directory is created and writable
+     */
+    public FileExceptionHandler(ExceptionType exceptionType) {
+        super("File exception handler", exceptionType);
+
+        this.reportsDirectory = new File(Directories.getWorkspace(), "reports");
+        if (!this.reportsDirectory.exists() || !this.reportsDirectory.isDirectory()) {
+            this.reportsDirectory.mkdir();
+        }
+
+        this.cleanOldErrors();
+    }
+
+    @Override
+    public void handle(Throwable e) {
+        File report = new File(this.reportsDirectory, "report-" + (System.currentTimeMillis() / 1000) + ".txt");
+        try {
+            report.createNewFile();
+
+            StringBuilder reportContent = new StringBuilder();
+            reportContent.append(e.getMessage() + "\n\n");
+
+            for (StackTraceElement stackTraceElement : e.getStackTrace()) {
+                reportContent.append(stackTraceElement);
+            }
+
+            FileUtil.writeFileContents(report, reportContent.toString());
+
+            if (!ignored) {
+                displayAlert(report);
+            }
+        } catch (IOException ex) {
+            ex.printStackTrace();
+        }
+    }
+
+    public boolean isIgnored() {
+        return ignored;
+    }
+
+    public FileExceptionHandler setIgnored(boolean ignored) {
+        this.ignored = ignored;
+        return this;
+    }
+
+    public File getReportsDirectory() {
+        return reportsDirectory;
+    }
+
+    /**
+     * Displays the dialog of the alert
+     *
+     * @param report
+     */
+    private void displayAlert(File report) {
+        int response = UILog.alert(
+                "Error occurred",
+                "We are sorry to inform you that an error occurred within Parabot.\n\n" +
+                        "The error has been written to a report file.\n" +
+                        "Please report the error to the Parabot staff with as much information as possible.",
+                new Object[]{
+                        "Close",
+                        "Open report",
+                        "Ignore " + this.getExceptionType().getName().toLowerCase() + " errors" },
+                1,
+                JOptionPane.WARNING_MESSAGE
+        );
+
+        switch (response) {
+            case 1:
+                try {
+                    Desktop.getDesktop().open(report);
+                } catch (Exception ex) {
+                    ex.printStackTrace();
+                }
+                break;
+            case 2:
+                ignored = true;
+                break;
+
+        }
+    }
+
+    /**
+     * Remove errors older than 24 hours
+     */
+    private void cleanOldErrors() {
+        File[] reports = this.reportsDirectory.listFiles();
+        if (reports != null) {
+            for (File report : reports) {
+                if (report.isFile()) {
+                    if ((System.currentTimeMillis() - report.lastModified()) / 1000 > 60 * 60 * 24) {
+                        report.delete();
+                    }
+                }
+            }
+        }
+    }
+}

src/main/java/org/parabot/environment/servers/executers/ServerExecuter.java

@@ -3,6 +3,8 @@ package org.parabot.environment.servers.executers;
 import org.parabot.core.Context;
 import org.parabot.core.ui.BotUI;
 import org.parabot.core.ui.components.PaintComponent;
+import org.parabot.environment.handlers.exceptions.ExceptionHandler;
+import org.parabot.environment.handlers.exceptions.FileExceptionHandler;
 import org.parabot.environment.servers.ServerProvider;
 
 /**
@@ -15,7 +17,7 @@ public abstract class ServerExecuter {
     public abstract void run();
 
     public void finalize(final ServerProvider provider, final String serverName) {
-        new Thread(new Runnable() {
+        Thread serverThread = new Thread(new Runnable() {
             @Override
             public void run() {
                 try {
@@ -30,7 +32,11 @@ public abstract class ServerExecuter {
                     t.printStackTrace();
                 }
             }
-        }).start();
+        });
+
+        serverThread.setUncaughtExceptionHandler(new FileExceptionHandler(ExceptionHandler.ExceptionType.SERVER));
+
+        serverThread.start();
     }
 
 }